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DOI: 10.1039/A904463I (Paper) Reference Section for: Phys. Chem. Chem. Phys., 1999, 1, 4645-4648

Structural studies of V2O5–WO3 and WO3–V2O5 solid solutions

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Mieczysława Najbar, Józef Camra, Anna Białas, Aleksandra Wesełucha-Birczyńska, Barbara Borzecka-Prokop, Laurent Delevoye and Jacek Klinowski

Abstract

Powder X-ray diffraction, Fourier transform Raman spectroscopy, solid-state NMR and X-ray photoelectron spectroscopy were used to determine the composition and structure of a mixed oxide containing 10 mol% V2O5 and 90 mol% WO3. The parent sample consists of hybrid crystallites of a tungsta-bronze isostructural with tetragonal WO3 but containing atomic vanadium in the bulk of the crystals and V(III) in the surface region, and of small crystals of strongly reduced vanadia-like surface species (V2O5–x with x=0.42). Further thermal treatment causes progressive surface segregation of vanadium from the V2O5–WO3 solid solution, accompanied by the formation of a WO3–V2O5 solid solution and partial tetragonal–monoclinic structural transformation of the bronze.

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